ASP.NET

Datalist state lost on postback

6-Jun-07 15:04

I'd expect to use a repeater to define a layout like this. It's more flexible, the gridview is more powerful when you want one row per record.

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: GridView or not?

Harini N K6-Jun-07 22:24

Harini N K

6-Jun-07 22:24

Hi
You can use DataList Server Control. You can set direction or no. of columns to display using the attribute RepeatDirection or RepeatColumns. Both are optional.

For eg.,

<code><asp:DataList id="DataList1" runat="server" RepeatDirection="Horizontal">
<ItemTemplate>
<table border=1>
<tr>
<td>
<%# DataBinder.Eval(Container.DataItem, "Au_ID") %>
</td>
</tr>
</table>
</ItemTemplate>
</asp:DataList>
</code>

Or, Check this link <a href="http://msdn2.microsoft.com/en-us/library/yfx4t9t7(VS.71).aspx">DataList Web Server Control</a>[<a href="http://msdn2.microsoft.com/en-us/library/yfx4t9t7(VS.71).aspx" target="_blank" title="New Window">^</a>]

Hope you got it.

Harini

werD6-Jun-07 14:09

werD

6-Jun-07 14:09

hello everyone, sorry so long

ive got an entry form that users are allowed to post to a log with. the form contains a datalist of checkboxes that are flags to filter by. when a user clicks certain checkboxes a radiobuttonlist showing parameters is displayed within the item. the problem occuring on postback is that the checkboxes and radios go back to there original state and i would lose files added to the listbox from the previous post back. In order to get around this i create a session value of a small structure that i use as a basic entry template. the structure contains 2 string collections that are related to files and flags.
this method seems to work exactly as expected for the listbox control but i dont seem to be getting any of the values from my datalist added to the session value ie the flag collection retruns a count of zero.

here is where im adding the values from files and from flags

the for loop is the problem i suppose as the values for the file collection appear but none from the datalist

<br />
'skipping the bulk<br />
                    Dim str As String = ""<br />
                    str = smf.location0 & ","<br />
                    str &= smf.name1 & ","<br />
                    str &= smf.caption2 & ","<br />
                    str &= smf.type3 & ","<br />
                    str &= smf.id4.ToString<br />
                    smsg.StrFileCol.Add(str)<br />
                    Me.lblFileStatus.Text = "File added as " & smf.name1<br />
<br />
<br />
                    For Each itm As DataListItem In Me.dlFlags.Items<br />
                        Dim chkbx As CheckBox = CType(itm.FindControl("chkFlag"), CheckBox)<br />
                        Dim hdn As HiddenField = CType(itm.FindControl("hdnFlagId"), HiddenField)<br />
<br />
                        Dim rdos As RadioButtonList = CType(itm.FindControl("rdoparam"), RadioButtonList)<br />
                        Dim flgstr As String = ""<br />
                        If chkbx.Checked = True Then<br />
                            If Not (rdos.SelectedValue =-1) Then<br />
                                flgstr = hdn.Value & ","<br />
                                flgstr &= rdos.SelectedValue<br />
                            Else<br />
                                flgstr = hdn.Value & ","<br />
                                flgstr &= 0<br />
                            End If<br />
                            smsg.StrFlagCol.Add(flgstr)<br />
                        End If<br />
                    Next<br />
                    Session("smsg") = smsg<br />
'also trying Session.Item("smsg") = smsg but they seem equivalent<br />
                End If<br />
<br />
              <br />
                Dim tempStr2 As String() = Split(gid, "-")<br />
                If tempStr2.Length = 5 Then<br />
                    Me.lboxFileUpload.Items.Insert(0, litm)<br />
                Else<br />
                    Me.lblFileStatus.Text = "Error Adding " & gid<br />
                End If<br />
            Else<br />
                Me.lblFileStatus.Text = "Please specify a title"<br />
            End If

i'm attempting to display this two different ways
the most obvious i thought would be

Protected Sub dlFlags_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataListItemEventArgs) Handles dlFlags.ItemDataBound<br />
       <br />
        Dim chk As CheckBox = CType(e.Item.FindControl("chkFlag"), CheckBox)<br />
        Dim xDs As XmlDataSource = xmldsflagparams<br />
        Dim hdn As HiddenField = CType(e.Item.FindControl("hdnFlagId"), HiddenField)<br />
        Dim rdo As RadioButtonList = CType(e.Item.FindControl("rdoparam"), RadioButtonList)<br />
        xDs.XPath = "//flag[@id='" & hdn.Value & "']//param"<br />
        rdo.DataSourceID = ""<br />
        rdo.DataSource = xDs<br />
        rdo.DataBind()<br />
        Dim spn As HtmlGenericControl = CType(e.Item.FindControl("radiolist"), HtmlGenericControl)<br />
        For Each flag As String In smsg.StrFlagCol<br />
            Dim strflag() As String = Split(flag, ",")<br />
            If strflag(0) = hdn.Value Then<br />
                chk.Checked = True<br />
            End If<br />
            If strflag(1) > 0 Then<br />
                rdo.SelectedValue = strflag(1)<br />
                spn.Style.Item("display") = "inline"<br />
            End If<br />
        Next<br />
        Dim lbl As New Label<br />
'this always returns 0<br />
        lbl.Text = smsg.StrFlagCol.Count<br />
        e.Item.Controls.Add(lbl)<br />
    End Sub

I would greatly appreciate any insight on this

werD, MCP

-- modified at 20:16 Wednesday 6th June, 2007

Re: Datalist state lost on postback

Christian Graus6-Jun-07 14:27

Re: Datalist state lost on postback

6-Jun-07 14:27

Odds are you bind to your data source in page load on postback ( sorry, this was too long for me to read it all ). this rests the control state and your viewstate is lost.

werD6-Jun-07 15:47

werD

6-Jun-07 15:47

Thanks for you response
i got to trying this and it when i dont call databind on the datalist when its a postback it disappears. why is this? ive been binding and then trying to set these values checked or not with a session variable, but if this would work without that overhead i would be thrilled

werD, MCP

Open a CSV from web to HTML table

mahmoud44196-Jun-07 10:47

mahmoud4419

6-Jun-07 10:47

Hi all,

I have been searching for two weeks till now for any code or idea about how to download a CSV file that is online to a web page. I need to download the CSV file under finance.yahoo.com for any stock to an HTML page. I have been trying to find what is the best way to do that. Please help me and let me know if you have any ideas or if you can help me.

Thanks!

Best regards and many thanks

Christian Graus6-Jun-07 10:57

6-Jun-07 10:57

Which bit are you stuck with ? You need to download the file, and then parse it to build your table.

mahmoud44196-Jun-07 13:39

mahmoud4419

6-Jun-07 13:39

Well, that's a good question. I am stuck with opening the file to html page. Thanks for getting back so quickly. I appreciate your help.

Best regards and many thanks

Christian Graus6-Jun-07 15:01

6-Jun-07 15:01

Well, your page definately needs to be active, not just HTML, and it needs to parse out the file on the server, to create a table.

mahmoud44197-Jun-07 3:52

mahmoud4419

7-Jun-07 3:52

Yes, I know. I was trying to do that with ASP, but could not find any thing that can help me opening a CSV file from the web to another page that I will be creating. I need this file instead to prompt a message either to save it on the hard drive or to view the file, I need it to open right away as soon as the page loads. I need this to be done on the fly and to open in a browser.

Thanks again Smile | :)

Best regards and many thanks

plz help me

Sankar Komma 6-Jun-07 6:55

Sankar Komma

6-Jun-07 6:55

I am using asp.net2.0, Show progress bar when page load as indication.
plz Any budy help... Cry | :((

k.ravi sankar

Not Active6-Jun-07 8:51

Not Active

6-Jun-07 8:51

priyaram1 wrote:
plz Any budy help

read How to get an answer to your question

only two letters away from being an asset

suchon_phuong6-Jun-07 9:01

suchon_phuong

6-Jun-07 9:01

dfgfdgfdgddgdfgd

Sankar Komma 8-Jun-07 7:55

Sankar Komma

8-Jun-07 7:55

hi friend

can u explain what it is?

Thank q

k.ravi sankar

Christian Graus6-Jun-07 10:57